Just to correct the beginning notion of this discussion, steam does not decide regional pricing, publishers do, though I’m sure they have some standard templates to use. Steam makes it possible but it is up to the people putting their games up for sale whether they want to offer regional prices or not. GOG offers the same functionality and were even better about it for a long while, so if this is the reason you’re discounting them then you might want to check them out again.
Why a tiny island nation or individual African country does not get their own price adjusted region is simply because they’re too small a market to warrant the effort of figure out what a representative pricing would be compared to the market they represent. It’s unfortunate and feels unfair I’m sure but I think it’s also perfectly understandable.